/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkPointFillPass.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkPointFillPass - Implement a post-processing fillpass
// .SECTION Description
//
// This pass is designed to fill in rendering of sparse point sets/coulds
// The delegate is used once and is usually set to a vtkCameraPass or
// to a post-processing pass.
//
// .SECTION See Also
// vtkRenderPass

#ifndef vtkPointFillPass_h
#define vtkPointFillPass_h

#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkDepthImageProcessingPass.h"

class vtkDepthPeelingPassLayerList; // Pimpl
class vtkFrameBufferObject;
class vtkOpenGLHelper;
class vtkOpenGLRenderWindow;
class vtkTextureObject;

class VTKRENDERINGOPENGL2_EXPORT vtkPointFillPass : public vtkDepthImageProcessingPass
{
public:
  static vtkPointFillPass *New();
  vtkTypeMacro(vtkPointFillPass,vtkDepthImageProcessingPass);
  void PrintSelf(ostream& os, vtkIndent indent);

  //BTX
  // Description:
  // Perform rendering according to a render state \p s.
  // \pre s_exists: s!=0
  virtual void Render(const vtkRenderState *s);
  //ETX

  // Description:
  // Release graphics resources and ask components to release their own
  // resources.
  // \pre w_exists: w!=0
  void ReleaseGraphicsResources(vtkWindow *w);

  // Description:
  // How far in front of a point must a neighboring point
  // be to be used as a filler candidate.  Expressed as
  // a multiple of the points distance from the camera.
  // Defaults to 0.95
  vtkSetMacro(CandidatePointRatio,float);
  vtkGetMacro(CandidatePointRatio,float);

  // Description:
  // How large of an angle must the filler candidates
  // span before a point will be filled. Expressed in
  // radians. A value of pi will keep edges from growing out.
  // Large values require more support, lower values less.
  vtkSetMacro(MinimumCandidateAngle,float);
  vtkGetMacro(MinimumCandidateAngle,float);

 protected:
  // Description:
  // Default constructor. DelegatePass is set to NULL.
  vtkPointFillPass();

  // Description:
  // Destructor.
  virtual ~vtkPointFillPass();

  // Description:
  // Graphics resources.
  vtkFrameBufferObject *FrameBufferObject;
  vtkTextureObject *Pass1; // render target for the scene
  vtkTextureObject *Pass1Depth; // render target for the depth

  // Structures for the various cell types we render.
  vtkOpenGLHelper *BlurProgram;

  bool Supported;
  bool SupportProbed;

  float CandidatePointRatio;
  float MinimumCandidateAngle;

 private:
  vtkPointFillPass(const vtkPointFillPass&);  // Not implemented.
  void operator=(const vtkPointFillPass&);  // Not implemented.
};

#endif
